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MSCPH-04

June - Examination 2018

MSc (Previous) Physics Examination

Semiconductor Devices Analog and Digital Electronics

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Paper - MSCPH-04

Time : 3 Hours ] [ Max. Marks :- 80

Note: The question paper is divided into three sections A, B and C. Write answers as per the given instructions.

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IÊS> Ho$ {ZX}emZwgma àíZm| Ho$ CÎma Xr{OE&

Section - A 8 × 2 = 16 Very Short Answer Questions (Compulsory)

Note: Answer all questions. As per the nature of the question delimit your answer in one word, one sentence or maximum up to 30 words. Each question carries 2 marks.

IÊS> - "A'

A{V bKw CÎmar¶ àíZ (A{Zdm¶©)

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617

MSCPH-04 / 200 / 4 (1) (P.T.O.)

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617

MSCPH-04 / 200 / 4 (2) (Contd.)

1) (i) What is depletion region in P-N junction diode?

P-N g§{Y S>m¶moS> ‘| Adj¶ joÌ ³¶m hmoVm h¡?

(ii) Write Shockley’s equation for FET.

FET Ho$ {bE em°H$bo g‘rH$aU {b{IE&

(iii) What is voltage regulator?

dmoëQ>Vm {Z¶m‘H$ ³¶m h¡?

(iv) Mention any two advantages of negative feedback.

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(v) Draw frequency response curve for an amplifier.

àdY©H$ Ho$ {bE Amd¥{Îm AZw{H«$¶m dH«$ H$mo ~VmBE&

(vi) Define input offset current for Op-Amp.

Op-Amp Ho$ {bE {Zdoe Am’$goQ> Ymam H$mo n[a^m{fV H$s{OE&

(vii) What is positive and negative logic?

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(viii) What is the use of decoder?

{dH$moS>H$ H$m ³¶m Cn¶moJ h¡?

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MSCPH-04 / 200 / 4 (3) (P.T.O.) 617

Section - B 4 × 8 = 32 (Short Answer Questions)

Note: Answer any four questions. Each answer should not exceed 200 words. Each question carries 8 marks.

IÊS> - ~ (bKw CÎma dmbo àíZ)

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200 eãXm| ‘| n[agr{‘V H$s{OE& àË¶oH$ àíZ 8 A§H$m| H$m h¡&

2) Explain principle and working of photo diode.

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3) Explain V-I characteristics curve for UJT.

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4) Describe working of full wave rectifier with circuit diagram.

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5) Describe close loop frequency response for Op-Amp.

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6) Describe Op-Amp as adder.

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7) State and prove De Morgan’s theorems.

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8) Prove NOR is universal gate.

9) Explain truth table of D - flip flop.

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617

MSCPH-04 / 200 / 4 (4)

Section - C 2 × 16 = 32 (Long Answer Questions)

Note: Answer any two questions. You have to delimit your each answer maximum up to 500 words. Each question carries 16 marks.

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10) Explain R-C phase shift oscillator with circuit diagram. Find necessary condition for sustaining oscillations.

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11) Describe construction, working and frequency of Astable Multivibrator.

12) Explain application of Op-Amp as waveform generator.

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13) Describe working of J-K Master Slave Flip flop with circuit diagram and truth table.

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